Integrated System for Photocatalytic Overall Water Splitting from Arid Air
Xueli Yan, Tian Li, Jie Huang, Xinyuan Zhao, Feng Liu, Rui Zhao, Xiangjiu Guan, Jinwen Shi, Wenshuai Chen, Maochang Liu
Abstract
H 2 produced through photocatalytic overall water splitting represents a sustainable energy. However, this approach is geographically constrained by freshwater availability, worsening the crisis in arid regions with abundant solar energy. This study introduces a MOF-801-hydrazine-SrTiO 3:Al (MS) composite for in situ photocatalytic H 2 production using only atmospheric water and sunlight. The MS benefits from the hygroscopic MOF-801-hydrazine for water capture and the photocatalytic SrTiO 3:Al for H 2 and O 2 . This system demonstrates effective in situ photocatalytic overall atmospheric water splitting in arid conditions, with a moisture adsorption capacity of 1.02 g H 2 O g MS –1 in 60 min at 30% relative humidity, and H 2 and O 2 production rates of 1033.1 and 494.3 μmol h –1 g S –1, respectively. This approach offers a novel solution for sustainable H 2 production using natural resources, crucial for water-scarce regions.